C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/110, 324/24
C25B 15/06 (2006.01) C25B 15/04 (2006.01)
Patent
CA 1153423
Abstract of the Disclosure An improved method and apparatus for adjusting the space between an adjustable anode and a cathode in an electrolytic cell wherein current measurements and voltage measurements are obtained for conductors to the anode sets and compared with predetermined standards for the same conductors and anode sets. Measurement of deviation from the predetermined standards are used to determine the direction of anode adjustment. A digital computer operably connected to motor drive means adapted to raise or lower anode sets upon appropriate electric signals from the computer is a preferred embodiment of this invention. In a preferred embodiment, potential incipient short circuits are detected and avoided by the improvement which comprises: (a) obtaining a first conductor current value proportional to current in said conductor, and storing said value in a table of old values, (b) obtaining the next conductor current value proportional to current in said conductor, and storing said value in a table of new values, (c) subtracting said first conductor current value from said next conductor current value for said conductor to obtain a first conductor current difference,.DELTA.a' (d) when .DELTA.a' negative or zero, recording zero as the value for .DELTA.a in said table of old values for said conductor, Abstract (Cont'd.) (e) when the value of .DELTA.a is positive, adding this value to any value for said conductor previously recorded in said table of old values to obtain .DELTA.t, (f) squaring the value of .DELTA.t to obtain .DELTA.s, (g) adding the value, .DELTA.s, to any sum previously recorded in said table of old values corresponding to the sum of previous increases for said conductor to obtain a new summation value, .DELTA.st, (h) replacing the conductor current values in the old table with the new conductor current values, (i) repeating steps (b)-(h), N times over a period of t seconds for said d conductor to obtain a new .DELTA.st for said conductor, (j) dividing said .DELTA.st by N to obtain a quotient, Q, for said conductor, and comparing Q with the conductor current value, and (k) raising said anodes connected to said conductor when Q exceeds a predetermined fraction of the conductor current value.
359540
Olin Corporation
Osler Hoskin & Harcourt Llp
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